I want to add a Talmudic source regarding this expression and its link with "forever'.
See Gemara Yoma 54.1, the Gemara try to say that it is necessarily forever, at list when it is written שם עד היום הזה, but the Gemara gives a counterexample and rejects definitively that it is necessarily forever, using the expression "tyuvta".
What do you say now? - He answered: l say that the Ark was hidden in its place, as it is said: 'And the staves were so long, etc.' Rabbah said to 'Ulla: How does it follow from this?(3) - Because it is written: 'Unto this day'. But does the term 'Unto this day' mean everywhere 'forever'?... - Would you say that wherever the word 'there' is used, it implies 'forever', but the following objection can be raised: And some of them, even of the sons of Simeon, five hundred men, went to Mount Seir, having for their captains Pelatiah, and Neariah, and Rephaiah, and Uzziel, the sons of Ishi. And they smote the remnants of the Amalekites that escaped, and dwelt there unto this day. But Sennacherib, King of Assyria, had come up already and confused all the lands as it is said: I have removed the bounds of the peoples, and have robbed their treasures? This is a refutation.